Introduction
7
Air filter
The main function of the air filter is to trap air borne par-
ticles before they reach the carburetor that can cause cat-
astrophic internal engine damage.
MTD vertical shaft engines are equipped with one
of two different air filters. The first is a round paper pleated
filter. The second is a round foam filter. See Figure 1.3.
• Air filters used on the MTD engine are designed
to prevent particles larger than 3-5 micron from
passing through into the engine.
• The filter should be checked on a regular basis
possibly several times in a season.
• Typically an air filter should be changed before
every season.
• If a foam air filter is dirty, but not in bad of condi-
tion, it can be cleaned and reused. The paper
pleated filters can be shaken or lightly tapped to
free the debris from the filter.
NOTE: Never use compressed air on a paper air filter. Compressed air will remove the tiny fibers that are used
to catch the dirt in the air. Without these fibers the filter is useless.
• Foam filters can be washed in warm soapy water.
NOTE: When drying a foam filter either squeeze it inside of a paper towel or let it air dry. DO NOT wring it.
Wringing the foam filter will cause damage to the foam.
NOTE: On foam filters, dry the filter throughly then apply a couple of drops of motor oil. Gently work the oil
through the filter before installing it.
NOTE: Always check with factory specification prior to servicing/replacing any engine components.
Figure 1.3
Foam filter
Paper-pleated element
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